Like Corion, I used Full Calendar to deliver the front end.

I rolled my own backend with Mojolicious. Someone else is pulling together the calendar data for another system and I'm pushing out the associated ical feeds. I making calls to an Oracle database and create calendar events with

while ( my ($name, $stime, $etime, $unid, $loc, $desc) = $sth->fetchro
+w_array() ) {
    my ($start, $end) = oracle_to_datetime($stime, $etime);
    push @event_list, {
          start => $start, 
          end => $end,
          summary => $name,
          location => $loc,
          description => $desc,
          uid => $unid,
        };
}
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where the oracle_to_datetime sub returns DateTime objects and then return a json object with

$self->render(json => \@event_list);
[download]

to FullCalendar.

I'm still finding my way with Mojolicious, but I think that's all it needed. Oh, and don't tell anybody how easy it was. My mistake :)